Just my two cents here:
Firstly, how much weight you pulling? If your towing heavy @ near/over limits than it is what it is.
As far as upgrades, I've had this conversation on other car forums and talked to a couple former Delphi brake engineers and bunch of club racers folks I know. The answer has always been stick to stock whatever that may be. The club racer guys I know said they are prohibited from racing at most tracks unless they run stock even under racing conditions.
Without getting into a whole debate and detail (because I couldn't do it justice in a post), it boils down to your brakes pads are only one component. In moving to slotted/drilled rotors your effectively changing the dynamics of the braking
(removing surface contact vs. maintaining ideal operating temps on the pads/rotor fatigue). There are fantastic benefits of the modified rotor under certain conditions and I agree with Mark. I personally love the initial stickiness when stopping and the cool look of the drilled/slotted.
That said, you are removing surface contact. Great debates are abundant on the internet, but basically It's the 80/20 rule, well more like 95/5 rule here for benefits based on your driving.
Wildasindrive posted great advice. You may have trailer brake issues. First thing is to have a good look at the entire system on both the TV and trailer.
If you do go with cross drilled and/or slotted like Mark has, please do yourself a favor and buy from a reputable manufacturer. There is alot of junk on the internet. Do your research for your particular vehicle.
Reputable companies like Summit Racing have upgrade towing kits that match a upgraded calibers, rotors, and pads. They're actually local for me and they're knowledgeable and usually match pricing on anything you find online like these -->https://www.summitracing.com/parts/p...ram/model/1500